Segment Information (Total Assets) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 674,266	$ 663,072
U.S.
Segment Reporting Information [Line Items]
Total assets	252,200	252,219
Asia
Segment Reporting Information [Line Items]
Total assets	152,901	148,305
Latin America
Segment Reporting Information [Line Items]
Total assets	69,148	63,687
EMEA
Segment Reporting Information [Line Items]
Total assets	17,455	16,860
MetLife Holdings
Segment Reporting Information [Line Items]
Total assets	151,213	148,749
Corporate & Other
Segment Reporting Information [Line Items]
Total assets	$ 31,349	$ 33,252